Insert into post – Custom Button

Hello friends,

I have created a plugin and works great but because the plugin uses shortcode I have created and custom button and form in the visual editor…

// the button…
add_action(‘media_buttons_context’, ‘add_my_custom_button’);
// the form, will be displayed when the user will click the custom button
add_action(‘admin_footer’, ‘add_inline_popup_content’);

So, my question is, how to get the entered values from the form and how to put in the visual editor ?

In the form I have
<input name=”url” … />
<input name=”width” … />
<input name=”height” … />

and I want to put in the editor in this format:
[my_shortcode url=”…” width=”…” height=”…”]

I need some like ‘Insert into post’ custom button…

Thanks!